Dimension question for the swayaholics

I made a old style fish,its great. I want to make something a bit faster (narrower)that will work on 2-6’surf and still rip. I was thinking towards a rocket fish. I am 145lbs 5’7" a bit slow at takeoff and will ride primarily in north carolina.

If you guys can help me with some good measurements including fin placement for twins would appreciate it.

Oh it will most likely be made from extruded or expanded foam and will be light. Thanks